Rotary brush



Patented Nov. 18, 1941 ROTARY BRUSH Johann A. F. Kamp, Boston," Mass.

Application May 24, 1940, Serial No. 336,948

2 claims.

This invention relates to rotary brushes and While especially adapted for use in the manufacture of shoes, are capable of general application. Rotary brushes are used extensively in shoe manufacture for cleaning the stitches that secure the soles and uppers together, for cleaning rubber heels, and for other purposes. Such annular tapering brushes are relatively short-lived and must be discarded when about one half the radial length of the bristles has been worn away. It is the principal object of the present invention to provide an annular tapering brush that has a much greater life than those of the prior art and that is useful even after as much as seven-eighths of the radial length of the bristles forming it has been worn away. With this object in View, my invention comprises a rotary brush having a central collar preferably of metal which has an annular extension integral therewith, the faces of the outer portion of such extension being inclined toward each other and preferably corrugated, serrated or grooved concentrically. Upon the respective faces of the tapering outer portion of the extension, two sets of bristles, respectively, are `placed and clamped firmly thereto by rings which preferably are corrugated, serrated or grooved concentrically, with the result that the outer portion of the bristles merge and form an annular tapering brush that is practically solid up to a point very close to the periphery of said annular extension.

In the drawing which accompanies and forms a part of this specification, Figure 1 is a plan view of the inner face of one of the brush clamping members.

Fig. 2 is a plan view of the outer face of a clamping member. Y

Fig. 3 isa fragmentary section taken on the line 3-3 of Fig. 5.

Fig. 4 is an exploded sectional view showing the collar with its annular `extension and the two clamping members prior to the insertion of the two sets of bristles between the extension and respective clamping members.

Fig. 5 is a perspective View of a brush embodying my invention.

In the particular drawing selected for more fully disclosing the principle of my invention and which is to be considered as illustrative, merely, and not restrictive, Ill is a central collar preferably of metal, such, for example, as aluminum, a coll-ar having an annular extension II, which preferably is formed integral therewith as shown, the faces I2, I2, of the outer portion of said extension preferably being inclined toward each other thereby forming an outwardly tapering base for receiving a set of bristles on each face thereof. Preferably, the outer portion of the annular extension is grooved concentrically, as shown at I3, although, of course, itwill be understood that the surface of this outer portion may be corrugated, serrated, or roughened in any suitable manner.

Co-operating with the collar and the outward extension thereof are means for securing the inner ends of the bristles to the respective annular extensions, such means being shown in the present instance as the annular clamping members I4, said clamping members being grooved, as indicated at I5, or corrugated, serrated or roughened in any suitable manner.

In assembling the brush, one end of tufts of bristles I'I are dipped in rubber cement, or other suitable adhesive, and after the cement has dried or become approximately dry a suitable adhesive, such as cement, is spread over the upper face of the grooved outer portion of the extension II, and the cemented inner ends of one set ofbristles are placed on the upper cemented face of I the inclined or tapered portions of the annular extension. One of the clamping rings I4 is then placed over `the collar and extension, the latter being shouldered at I6 to properly position such ring. The assembly is now inverted and the process repeated with respect to the other face of the extension, whereupon the other clamping ring is disposed on the collar and extension, the inner ends I I of the two sets of bristles now being disposed between the outer portion of the extension and the inner faces of the clamping rings. The'nal step in the assembly consists in forcing the clamping rings down against the tapered portion of the extension of the collar so as to firmly clamp the inner ends of the two sets of brushes to the respective faces of the outer portion thereof. This may conveniently be done by placing the assembled brush between two dished members (not shown), the peripheral portions of which are shaped complementarly to the final form of the clamping rings I4 and suitable pressure exerted on said members to bend them to the form shown in Fig. 3, a portion of one of the said dished members being indicated at I8.

The brush may be secured to the shaft that passes through the collar by the set screw I9, or frictionally, or in any other suitable manner.

Experience has shown that brushes constructed in accordance with this invention `may be used for their intended purpose until the bristles have been worn down to approximately the point indicated at 20, where the two sets of bristles begin to merge to form an annular tapered brush.

Having thus described an illustrative embodiment of my invention without, however, limiting the same thereto, What I claim and desire to secure by Letters Patent is:

1. A rotary brush comprising a central collar having an annular extension integral therewith and tapering outwardly, the outer side portions of said annular extension being corrugated conoentrcally, two sets of radially disposed bristles having their inner ends disposed on the respective corrugated portions of said annular extension and their outer portions merging to form a tapering annular brush, and means for securing the inner ends of said bristles to the respective outer side portions of said annular extension.

2. A rotary brush comprising a central collar having an annular extension integral therewith and tapering outwardly, two sets of radially disposed bristles having their inner ends disposed on the respective faces of said extension and their outer portions merging to form a tapering annular brush, and annular clamping members disposed on the respective faces of said extension for clamping the inner ends of said bristles to the respective outer side portions of said extension, the inner side portions of said clamping members being corrugated concentrically.

JOHANN A. F. KAMP. 

